Products > Test Equipment
How to calibrate Siglent SPD1000X / SPD3303X / SPD3303X-E series power supplies?
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Peter_O:
Did the FW upgrade to SPD3303X_V1.01.01.02.07R2_EN with an "upgraded" 3303X-E yesterday. At first glance the calibration stays well within specs.
oz2cpu:
some of you with a SPD3303 might find this video interesting ?

https://youtu.be/BBW8dv2ImOc

Noise ? or low frequency instability ?
or just the regulation loop ?

why is it not on a super cheap supply ?
tautech:

--- Quote from: oz2cpu on February 11, 2021, 09:49:13 pm ---some of you with a SPD3303 might find this video interesting ?

https://youtu.be/BBW8dv2ImOc

Noise ? or low frequency instability ?
or just the regulation loop ?

why is it not on a super cheap supply ?

--- End quote ---
Any AC ripple from the cheap SMPS is likely influenced by the 2V AC voltage accuracy spec of the SDM3055:

20 KHz – 50 KHz = +1.0% of reading + 0.05% of range
P5 in the datasheet:
https://int.siglent.com/upload_file/user/SDM3055/SDM3055_DataSheet_DS06035-E03E.pdf

Whereas the SPD3303X is a linear PSU therefore any ripple is 2x mains frequency and measured result will be more accurate. Comparisons such as this need be done with a scope so to properly see the full noise/ripple picture.  ;)
oz2cpu:
YES that is exactly what i would expect too,
how ever the result is just the opposite, the SPD3303X is the one with more "jitter" but less noise
oz2cpu:
the SDM3055 voltmeter can reveal the odd stepped voltage signal from the SPD3303

so something is affecting the voltage in a special stepped way, however the levels of this is insanely low !!
it is 50uV so there is now way to see this with a normal scope.

just to verify my test setup, i connected the cheap MINLEAF NPS605W
and saw the stepped surve is compleetly gone,

by the way . WOW I am happy about the SDM3055 voltmeter
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